Driving belt and the like



Aug. 7 1923;

4 H. GUILLOU DRIVING BELT AND THE LIKE Filed Jan. 18 1921 v v g/vra azi w 7/445 relented Aug, 7, lilfiii.

HENRI GUILLOU, F MUNTBOUGE, FRAHCE.

DRIVING BELT AND THE Application flled'l'anuarp' 18, 1.921. serial @9393.

To all whom it may concern:

Be it known that I, Haunt Gmnnon, citizen of the French Republic, residing at 4'1 Rue de lf-agneux, Montrouge, Seine, France,

t have invented new and useful improve ments in. Driving Belts and the like, of which the following is a specification.

This invention relatesto driving belts.

Hitherto driving belts used industrially have had two grave disadvantages arising of flexibility and suppleness in a transverse direction, and also from the fact'that small air pockets are imprisoned against the rim of the pulley by the belt, and particularly in the-case of high speeds of rotation, these air pockets prevent the total contact necessary for the good working of the belt. These disadvantages compel the use of large pulleys and large beltswhich involves great loss of power necessary-to compensate for thelack of adhesion, the-principle of operation of transmission by belts being based on. the adhesion. v

Chrome leather which is more flexible and has a better adhesion has sometimes been substituted for tanned. leather; nevertheless, its use has been rapidly abandoned by reason of the great stretching of belts made with this leather, which involves frequent stoppage for the purpose of shortening or tightening up the belts.

The improved arrangement of driving belt having great adhesion, hereinafter described, overcomes these disadvantages.

According to this invention, a belt is provided which is composed of difi'erent substances having difl'erent properties, arranged and connected in a special and improved manner, with the object of producing a belt having great resistance to traction with a minimum power'of stretching, great :1 adhesion and greattransverse flexibility, from the fact on the one hand of the inner material being arranged in longitudinal bands separated by longitudinal continuous passages, and on the other hand of the parts which fasten together the said materials acting as ventilators.

I this object, the guter part of the driving belt or bandthc dutyot which is to resist the traction effect Without undergoing appreciable elongation, is made of tanned to leather, cotton, rubberized cloth and the like, While the inner part which comes in contact with the pulley'is'lorxiied of a particularly adhesive material having the properties of fiexibilit great adhesion; this adhesive material ma be of chrome tanned leather or a product having an indie rubber basis or any other 7 product having the requisite qualities of adhesion which exclude in general a great re' sistance to traction; this adhesive material is arranged preferably in the form of con tinuous longitudinal hands slightly spaced apart with the tripleobject of first not injuring the transverse suppleness of the belt,

second of creating between the bands longitudinal continuous passages draining away the air bubbles which, particularly at high speeds, are created between the contacting surfaces of the belt and the pulley and con- 89 scquentlyjinjure the adhesion, and thirdly of increasing the pressure per unit of surface in contact.

The connection between the traction band and the adhesive material is obtained at a certain number of points more or less spaced apart by means of-stitching points, rivets,

or suitable clasps in such a Way as, to produce 111 the adhcslve materialowing to its plasticity a sort of local depression at each 0 of the points of attachment. The result isthat when the adhesive material is in con tact with the rim of the pulley owing to the plasticity of this material as Well as the specific pressure, air is expelled partly from these cathodes; consequently they perform to some extent the office of ventilators and very effectually assist the adhesion.

. The invention will be more particularly described with reference to the accompanying drawings, in which Figs. 1. and 2 are plan views respectively of the outer and inner faces of a belt con structed in accordance with the present invcntion.

Fig. 3 is a longitudinal section made on the line y y of Fig. 2.

Fig. 4 is a transverse section on the line of Fig. 1.

The outer part of the belt a which forms no the traction band is fiat externally and preferably divided internally by, slots or grooves and plasticity producing 65 a into a certain number of rectilinear rivets passing through the whole thick ness of the belt. Each of the longitudinal bands (Z is not necessarily in one piece; 1t

. may be formed by a certain number of strips fixed end to end and imbrioated to form a single and similar thickness and continuous contact surface. A small interval 6 is reserved opposite the slots or grooves at be tween the adjacent adhesive bands 03 and forms a continuous longitudinal passage. Rivets a slightly compressing the adhesive material (1 form a series of local depression 0 which produce a suction effect at the moment when this portion of the adhesive band is pressed on the rim of the pulley and will complete its adherence.

What I claim and desire to secure by Letters Patent is v 1. A driving belt, comprising, in combination, an external band of traction resisting material, provided at its inner side with a, plurality of longitudinally extending grooves, a plurality of internal longitudinal bands of uniform thickness secured to the inner side witha plurality of longitudinally extending grooves, a plurality of internal, longitudinally extending bands of uniform thickness secured/to the inner side of said external band, said internal bands being formed of chrome leather possessing a supple and strongly adhesive surface and spaced apart from each other thereby to form between them longitudinal grooves parallel and communicating with the grooves of the external band, and metallic fasteners securing the internal and external bands together, said vfasteners being countersunk within the internal bands thereby to form local depressions 0n the inner side of the belt.

In testimony whereof I have name to this specification.

HENRI GUILLOU.

signed my 60 

